Is a type of spectrogram calculation. It can be acquired by rendering frequencies logarithmically, with a certain corner frequency (threshold).
Published in Chapter:
Behavior Classification of Egyptian Fruit Bat (Rousettus aegyptiacus) From Calls With Deep Learning
Batuhan Yılmaz (Boğaziçi University, Turkey), Melih Sen (Marmara University, Turkey), Engin Masazade (Marmara University, Turkey), and Vedat Beskardes (Istanbul University-Cerrahpasa, Turkey)
Copyright: © 2022
|Pages: 39
DOI: 10.4018/978-1-7998-8686-0.ch004
Abstract
Sensing the environment with passive acoustic sensors has been used as a very useful tool to monitor and quantify the status and changes on biodiversity. In this chapter, the authors aim to classify the social calls (biting, feeding, fighting, isolation, mating protest, and sleeping) of a certain bat species, Egyptian fruit bat, which lives in colonies with thousands of others. Therefore, classification of their calls not only helps us to understand the population dynamics but also helps us to offer distinct environmental management procedures. In this work, the authors use the database previously presented in Prat et al. and present the social call classification results under both classical machine learning techniques and a convolutional neural network (CNN). The numerical results show that CNN improves the classification performance up to 20% as compared to the traditional machine learning approaches when all the call classes are considered. It has also been shown that the classes of aggressive calls, which can sound quite close to each other, can be distinguished with CNN.